W REG ESTATE 1.6 16V FUEL PROBLEM.

2000 Ford Focus

It was getting through nearly double the amount of fuel it should. After no leaks were visible and there were no spots on the floor I decided to plug in my diagnostic equipment to look for trouble codes when I didnt find any I was bemused so I started testing systems through the diagnostic interface and low and behold it came up with the following: Evapourative fuel system leak ! How can I find the location of this and how can I remedy it? Please help me !